4 years ago, the population of a city was "x" inhabitant. 2 years later, two years ago, the population of this same city was 81,000 and today it is 65,610. Using this data, finds the population of four years ago

59049.

Step-by-step explanation:

It is given that, 2 years later, two years ago, the population of this same city was 81,000 and today it is 65,610.

So, graph passing through (2,81000) and (-2,65610).

The general exponential function is

where, a is initial value or present year population and b is growth factor.

Since graph passing through (2,81000) and (-2,65610), therefore the above equation must be satisfied by these points.

   ...(1)

   ...(2)

Multiplying (1) and (2), we get

Taking square root on both sides.

Substitute a=72900 in (1).

Taking square root on both sides.

So, the population function is

Substitute x=-4 in the above equation, to find the population of four years ago.

Therefore, the population of four years ago is 59049.

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: